Fix valid address attribute and query parameter issues in distance subscription

	"encoding/json"

	"errors"

	"fmt"

	"net"

	"net/http"

	"net/url"

	"os"

	}

	return nil

}

func isValidIPAddress(ip string) bool {

	return net.ParseIP(ip) != nil

}

// sendTerminationConfirmation sends a termination confirmation message for the given application instance ID

// to indicate that the application is terminating to the App Support API.

// Finally, it constructs the response containing the user list and sends it as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// apGet retrieves information about access points within a specific zone and returns it as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// the JSON response to the HTTP response writer.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

func zonesGet(w http.ResponseWriter, r *http.Request) {

// the JSON response to the HTTP response writer.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

func zonesByIdGet(w http.ResponseWriter, r *http.Request) {

// distanceSubDelete deletes a distance subscription identified by its ID and returns a JSON response with no content.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// distanceSubListGet retrieves a list of distance subscriptions and returns them as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// If there's an error during JSON marshaling, it returns a 500 Internal Server Error status code using errHandlerProblemDetails.

func distanceSubListGet(w http.ResponseWriter, r *http.Request) {

	w.Header().Set("Content-Type", "application/json; charset=UTF-8")

	// Check for query parameters

	if len(r.URL.Query()) > 0 {

		errHandlerProblemDetails(w, "Query parameters are not allowed", http.StatusBadRequest)

		return

	}

	var response InlineNotificationSubscriptionList

	var subscriptions []Subscription

// distanceSubGet retrieves a distance subscription identified by its ID and returns it as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// distanceSubPost creates a new distance subscription based on the provided data in the request body and returns the created subscription as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// distanceSubPut updates an existing distance subscription with the provided data in the request body and returns the updated subscription as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// areaSubDELETE deletes a subscription for a specific area or circle identified by its ID and returns a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// areaSubListGET retrieves a list of area or circle subscriptions and returns it as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// areaSubGET retrieves information about a subscription for a specific area or circle identified by its ID and returns it as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// areaSubPOST creates a new subscription for a specific area or circle and returns the created subscription as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// areaSubPUT updates an existing subscription for a specific area or circle and returns the updated subscription as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// It returns the list of subscriptions as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// If a subscription is found in either type, it deletes the subscription entry and deregisters it from the respective tracking system.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// If no subscription is found for the given ID, it returns a 404 Not Found response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// Otherwise, it delegates the handling to the appropriate function based on the type of subscription.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// If successful, it returns a 201 Created response with the created subscription details.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	requestBody: map[string]interface{} - a map containing the request body decoded from JSON.

//

			errHandlerProblemDetails(w, "Mandatory Address parameter not present", http.StatusBadRequest)

			return

		}

		if !isValidIPAddress(userSubBody.Address) {

			log.Error("Invalid Address parameter")

			errHandlerProblemDetails(w, "Invalid Address parameter", http.StatusBadRequest)

			return

		}

		if userSubBody.SubscriptionType != "UserLocationEventSubscription" {

			log.Error("Mandatory SubscriptionType parameter not present or invalid")

			errHandlerProblemDetails(w, "Mandatory SubscriptionType parameter not present or invalid", http.StatusBadRequest)

// If successful, it returns a 201 Created response with the created subscription details.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	requestBody: map[string]interface{} - a map containing the request body decoded from JSON.

//

// If neither type of subscription is found in the request body, it constructs and returns a Bad Request response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

func zoneSubPUT(w http.ResponseWriter, r *http.Request) {

// If only one type of subscription is present, it calls the corresponding handler function to process the update.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// registers the updated subscription, constructs the response, marshals it into JSON format, and writes it to the HTTP response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	requestBody: map[string]interface{} - a map containing the subscription details extracted from the request body.

//	subscriptionID: string - the ID of the subscription extracted from the endpoint URL.

// registers the updated subscription, constructs the response, marshals it into JSON format, and writes it to the HTTP response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	requestBody: map[string]interface{} - a map containing the subscription details extracted from the request body.

//	subscriptionID: string - the ID of the subscription extracted from the endpoint URL.

// and performs the update operation.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	requestBody: map[string]interface{} - the request body containing the event-based subscription information.

//	subscriptionID: string - the ID of the subscription to be updated.

// and performs the update operation.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	requestBody: map[string]interface{} - the request body containing the periodic-based subscription information.

//	subscriptionID: string - the ID of the subscription to be updated.

// Finally, it constructs the response containing the subscription list and sends it as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//

// If a zone status subscription is found, it performs similar deletion and deregistration steps as above.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

func zoneSubDELETE(w http.ResponseWriter, r *http.Request) {

// Finally, it marshals the response into JSON format and writes it to the HTTP response body.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

func zoneSubGET(w http.ResponseWriter, r *http.Request) {

// If both types of subscriptions are present in the request body, it returns a 400 Bad Request response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

func zoneSubPOST(w http.ResponseWriter, r *http.Request) {

// Otherwise, it registers the subscription and returns a 201 Created response with the subscription details.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	requestBody: map[string]interface{} - the request body containing the subscription details.

func handleZoneStatusSubscription(w http.ResponseWriter, requestBody map[string]interface{}) {

// Otherwise, it registers the subscription and returns a 201 Created response with the subscription details.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	requestBody: map[string]interface{} - the request body containing the subscription details.

func handleZoneLocationEventSubscription(w http.ResponseWriter, requestBody map[string]interface{}) {

// distanceGet calculates the distance between two geographical points or addresses and returns the result as a JSON response.

//

// Parameters:

//

//	w: http.ResponseWriter - an interface used to manipulate the HTTP response.

//	r: *http.Request - a pointer to the HTTP request received.

//